Here are some pictures Simon Perry posted of the event.
200,000 March Against Bush in London
By Naveed Raja for The Mirror.
A massive demonstration against George Bush drew up to 200,000 marchers on the streets of London today.
Organisers of the march, ending in a rally at Trafalgar Square, said the number was a record for any weekday protest in Britain.
With a huge police presence the Met reported no incidents of violence and the march passed off peacefully.
“This phenomenal response shows the depth of feeling of the British public towards this visit,” said a spokesman for the Stop The War Coalition.
The march started near Euston Station and went past the House of Commons and Whitehall before finishing at Trafalgar Square.
When the march passed Downing Street anti-war protesters booed and jeered at Bush and Blair inside number 10.
A huge papier mache statue of Bush was hauled down by protestors in Trafalgar Square in protest at the Iraq war.
Vietnam veteran Ron Kovic, on whose life the film Born on the Fourth of July was based, was the guest of honour.